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PDF SD45216RJATR Data sheet ( Hoja de datos )

Número de pieza SD45216RJATR
Descripción HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER
Fabricantes Silan Microelectronics 
Logotipo Silan Microelectronics Logotipo



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SD45216_Datasheet
HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER WITH
ADJUSTABLE CURRENT LIMIT FOR AUTOMOTIVE APPLICATIONS
DESCRIPTION
The SD45216 is a high efficiency step down DC-DC converter
with adjustable current limit in compact ESOP-8 package,
including an error amplifier, ramp generator, current comparator,
slope compensation, current sense and logic driver. It also
integrates a current error amplifier to have a constant voltage
and constant current control.
Peak current mode PWM control with external adjustable
compensation provides a stable and high efficient operation over
ESOP-8-225-1.27
(With heatsink at the bottom)
a wide range of load currents. By means of an on board current
sense resistor and the availability of the current sense pins, a
current limit programming is very simple and accurate.
The internal robust PMOS transistor with a typical of 100 m
assures high efficiency even at high output current level. The APPLICATIONS
internal limiting current of typical value of 3.5 A, output short and
over temperature protection, protect the device from accidental
damage.
The internal fixed switching frequency of 120 kHz, and the
ESOP-8 package pin allow building an ultra compact DC/ DC
converter with a minimum board space.
* Automotive applications
* Chargers for NiCd, NiMH batteries
* Simple step-down converters with
adjustable current limit
* Adjustable current generator
FEATURES
* Up to 2.1A output current
* Up to 90% Efficiency
* Operating voltage can be up to 40V
* 120 kHz Internal Jitter Frequency for lower EMI
* Patent -Pending Short Circuit Protection
* Patent -Pending Output Voltage Compensation
* Adjustable current limit
* Over Temperature Protection
* Small SOP-8 Package
ORDERING INFORMATION
Part No.
SD45216JA
SD45216JATR
SD45216RJA
SD45216RJATR
Package
ESOP-8-225-1.27
ESOP-8-225-1.27
ESOP-8-225-1.27
ESOP-8-225-1.27
Marking
45216JA
45216JA
5216RJA
5216RJA
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tube
Tape&Reel
Tube
Tape&Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.6
2011.11.18
Page 1 of 8

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SD45216RJATR pdf
SD45216_Datasheet
Component Selection
— Inductor Selection
The SD45216 can utilize small inductors due to its fast 120kHz switching frequency. Typically, a 100μH
inductor is recommended for most applications. Larger values of inductance will allow greater output current
capability by reducing the inductor ripple current. Increasing the inductance above will also increase size.
The inductor current ripple is typically set for 20% to 40% of the maximum inductor current (IP). The inductor
should have low ESR (series resistance of the windings) to reduce the power losses, and must be able to
handle the peak inductor current without saturating. To minimize radiated noise, use a shielded bobbin
inductor.
— Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should be used to minimize the output voltage ripple. The
parallel of multilayer ceramic and electrolytic capacitors is an excellent choice as they have extremely low
ESR and are low cost. A parallel of 10μF ceramic capacitor and 470μF electrolytic capacitor is sufficient for
most applications. Larger values may be used to obtain extremely low output voltage ripple and improve
transient response.
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. It
follows that ceramic capacitors are also a good choice for input decoupling, and should be located as close as
possible to the device. A 10μF input capacitor is sufficient for virtually any application.
For all the ceramic capacitors above, X5R and X7R dielectric materials are preferred, for their ability to
maintain capacitance over wide voltage and temperature ranges.
TYPICAL APPLICATION CIRCUIT
Figure 1. Application Circuit for 5V/2.1A Output2.25A Current Limit
Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based
on the real test.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.6
2011.11.18
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